COOL2023 - List of Authors (Kayran, D.)

Paper	Title	Page
MOPAM2R1	Accelerator Physics Requirements for Electron Cooler at the EIC Injection Energy	1
	A.V. Fedotov, D. Kayran, S. Seletskiy BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy. An electron cooler using RF-accelerated electron beam is presently under design to provide required cooling of protons at the EIC injection energy of 24 GeV. In this paper, we describe accelerator physics requirements and design considerations of such 13 MeV electron cooler, including associated challenges.
	Slides MOPAM2R1 [2.281 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-COOL2023-MOPAM2R1
About •	Received ※ 20 October 2023 — Revised ※ 26 October 2023 — Accepted ※ 04 November 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAM1R2	Studies of Ion Beam Heating in LEReC
	S. Seletskiy, A.V. Fedotov, D. Kayran BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy. Electron beam created by either electron coolers or electron lenses in an ion storage ring can cause an unwanted emittance growth (heating) of the ion bunches. In this paper we report experimental studies of the electron-ion heating at the Low Energy RHIC electron Cooler (LEReC).
	Slides TUPAM1R2 [2.461 MB]
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WEPAM1R2	Advances and Challenges in Coherent Electron Cooling Experiment at RHIC
	V. Litvinenko Stony Brook University, Stony Brook, USA J.C. Brutus, D. Chan, A.J. Curcio, L. DeSanto, K. Decker, A. Di Lieto, K.A. Drees, R.L. Hulsart, M. Ilardo, P. Inacker, Y.C. Jing, D. Kayran, J. Ma, G.J. Mahler, R.J. Michnoff, G. Narayan, L.K. Nguyen, M.C. Paniccia, W.E. Pekrul, I. Petrushina, I. Pinayev, M.P. Sangroula, S. Seletskiy, F. Severino, K. Shih, J. Skaritka, L. Smart, Z. Sorrell, A. Sukhanov, R. Than, G. Wang, D. Weiss, A. Zaltsman BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886. We discuss current advances and remaining challenges in demonstrating Coherent electron Cooling for 26.5 GeV/u ion beam circulating in Relativistic Heavy Ion Colder, RHIC. Since 2020, the CeC experiment utilizes a 4-cell Plasma Cascade micro-bunching Amplifier (PCA) with bandwidth of 20 THz. We report on results obtained during CeC last four years of CeC experiment, including measurements of ion imprint in electron beam, demonstration of high PCA gain and observation of recombination of electrons and Au ions. While we were unable to clearly established CeC cooling, we clearly observed weak regular electron cooling of 26.5 GeV/u ions - the record energy for electron cooling. We discuss challenges experienced during last runs, improvements to the CeC X system and our plans for demonstration of CeC cooling in near future.
	Slides WEPAM1R2 [6.149 MB]
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THPAM2R2	Design to Achieve Uniform Electron Beam in Coherent Electron Cooling
	Y.C. Jing, A.V. Fedotov, D. Kayran, V. Litvinenko, J. Ma, I. Petrushina, I. Pinayev, S. Seletskiy, K. Shih, G. Wang BNL, Upton, New York, USA V. Litvinenko Stony Brook University, Stony Brook, USA I. Petrushina SUNY SB, Stony Brook, New York, USA K. Shih SBU, Stony Brook, New York, USA
	The Coherent electron Cooling (CeC) proof of principle experiment requires a high quality electron beam with uniform temporal profile in the cooling section for optimized cooling performance. Due to the nature of strong ballistic compression in the CeC accelerator, a regular initial laser distribution fails to generate such uniform electron beam. Wide choices of initial laser profile with unconventional beam distributions have been studied in simulation. In this paper, we present our findings to possible solution(s) in achieving the uniform electron beam for cooling experiments.
	Slides THPAM2R2 [3.888 MB]
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THPOSRP01	Influences of the Longitudinal Shift of the Electron Bunch to the Longitudinal Cooling Rate	46
	G. Wang, A.V. Fedotov, D. Kayran BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy. As two major techniques of cooling a bunched hadron beam in a storage ring, both coherent electron cooling and rf-based traditional electron cooling involve overlapping the cooling electron bunches with the circulating ion bunch. It is common for the cooling electron bunch to have a longitudinal offset from the center of the ion bunch either due to multiple electron bunches being used for cooling a single ion bunch or for the ions with large synchrotron amplitude to be cooled more efficiently. In this work, we derive how the cooling rate is affected by such a longitudinal offset. We use the EIC pre-cooler as an example to study how different overlapping pattern of the cooling electron bunches, e.g. the number of the cooling electron bunches and their longitudinal positions, affect the evolution of the circulating hadron bunches.
DOI •	reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP01
About •	Received ※ 06 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 21 November 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOSRP17	Development of an ERL for Coherent Electron Cooling at the Electron-Ion Collider	87
	K.E. Deitrick, S.V. Benson JLab, Newport News, Virginia, USA W.F. Bergan, A.V. Fedotov, D. Kayran, E. Wang, D. Xu BNL, Upton, New York, USA J.V. Conway, B.M. Dunham, R.G. Eichhorn, C.M. Gulliford, V.O. Kostroun, C.E. Mayes, K.W. Smolenski, N.W. Taylor Xelera Research LLC, Ithaca, New York, USA N. Wang Cornell University, Ithaca, New York, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract DE-AC05-06OR23177 and Brookhaven Science Associates, LLC, Contract DE-SC0012704; Xelera supported by U.S. DOE grant DE-SC0020514. The Electron-Ion Collider (EIC) is currently under development of to be built at Brookhaven National Lab and requires cooling during collisions in order to preserve the quality of the hadron beam despite degradation due to intra-beam scattering and beam-beam effect. An Energy Recovery Linac (ERL) is being designed to deliver the necessary electron beam for the Coherent electron Cooling (CeC) of the hadron beam, with an electron bunch charge of 1 nC and an average current of 100 mA; two modes of operation are being developed for 150 and 55 MeV electrons, corresponding to 275 and 100 GeV protons. The injector of this SHC-ERL is shared with the Precooler ERL, which cools lower energy proton beams via bunched-beam cooling, as used in Low Energy RHIC electron Cooling (LEReC). This paper reviews the current state of the design.
DOI •	reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP17
About •	Received ※ 11 October 2023 — Accepted ※ 12 October 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Accelerator Physics Requirements for Electron Cooler at the EIC Injection Energy

1

A.V. Fedotov, D. Kayran, S. Seletskiy
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
An electron cooler using RF-accelerated electron beam is presently under design to provide required cooling of protons at the EIC injection energy of 24 GeV. In this paper, we describe accelerator physics requirements and design considerations of such 13 MeV electron cooler, including associated challenges.

Slides MOPAM2R1 [2.281 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-COOL2023-MOPAM2R1

About •

Received ※ 20 October 2023 — Revised ※ 26 October 2023 — Accepted ※ 04 November 2023 — Issued ※ 02 December 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAM1R2

Studies of Ion Beam Heating in LEReC

S. Seletskiy, A.V. Fedotov, D. Kayran
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
Electron beam created by either electron coolers or electron lenses in an ion storage ring can cause an unwanted emittance growth (heating) of the ion bunches. In this paper we report experimental studies of the electron-ion heating at the Low Energy RHIC electron Cooler (LEReC).

Slides TUPAM1R2 [2.461 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAM1R2

Advances and Challenges in Coherent Electron Cooling Experiment at RHIC

V. Litvinenko
Stony Brook University, Stony Brook, USA
J.C. Brutus, D. Chan, A.J. Curcio, L. DeSanto, K. Decker, A. Di Lieto, K.A. Drees, R.L. Hulsart, M. Ilardo, P. Inacker, Y.C. Jing, D. Kayran, J. Ma, G.J. Mahler, R.J. Michnoff, G. Narayan, L.K. Nguyen, M.C. Paniccia, W.E. Pekrul, I. Petrushina, I. Pinayev, M.P. Sangroula, S. Seletskiy, F. Severino, K. Shih, J. Skaritka, L. Smart, Z. Sorrell, A. Sukhanov, R. Than, G. Wang, D. Weiss, A. Zaltsman
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886.
We discuss current advances and remaining challenges in demonstrating Coherent electron Cooling for 26.5 GeV/u ion beam circulating in Relativistic Heavy Ion Colder, RHIC. Since 2020, the CeC experiment utilizes a 4-cell Plasma Cascade micro-bunching Amplifier (PCA) with bandwidth of 20 THz. We report on results obtained during CeC last four years of CeC experiment, including measurements of ion imprint in electron beam, demonstration of high PCA gain and observation of recombination of electrons and Au ions. While we were unable to clearly established CeC cooling, we clearly observed weak regular electron cooling of 26.5 GeV/u ions - the record energy for electron cooling. We discuss challenges experienced during last runs, improvements to the CeC X system and our plans for demonstration of CeC cooling in near future.

Slides WEPAM1R2 [6.149 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAM2R2

Design to Achieve Uniform Electron Beam in Coherent Electron Cooling

Y.C. Jing, A.V. Fedotov, D. Kayran, V. Litvinenko, J. Ma, I. Petrushina, I. Pinayev, S. Seletskiy, K. Shih, G. Wang
BNL, Upton, New York, USA
V. Litvinenko
Stony Brook University, Stony Brook, USA
I. Petrushina
SUNY SB, Stony Brook, New York, USA
K. Shih
SBU, Stony Brook, New York, USA

The Coherent electron Cooling (CeC) proof of principle experiment requires a high quality electron beam with uniform temporal profile in the cooling section for optimized cooling performance. Due to the nature of strong ballistic compression in the CeC accelerator, a regular initial laser distribution fails to generate such uniform electron beam. Wide choices of initial laser profile with unconventional beam distributions have been studied in simulation. In this paper, we present our findings to possible solution(s) in achieving the uniform electron beam for cooling experiments.

Slides THPAM2R2 [3.888 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOSRP01

Influences of the Longitudinal Shift of the Electron Bunch to the Longitudinal Cooling Rate

46

G. Wang, A.V. Fedotov, D. Kayran
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
As two major techniques of cooling a bunched hadron beam in a storage ring, both coherent electron cooling and rf-based traditional electron cooling involve overlapping the cooling electron bunches with the circulating ion bunch. It is common for the cooling electron bunch to have a longitudinal offset from the center of the ion bunch either due to multiple electron bunches being used for cooling a single ion bunch or for the ions with large synchrotron amplitude to be cooled more efficiently. In this work, we derive how the cooling rate is affected by such a longitudinal offset. We use the EIC pre-cooler as an example to study how different overlapping pattern of the cooling electron bunches, e.g. the number of the cooling electron bunches and their longitudinal positions, affect the evolution of the circulating hadron bunches.

DOI •

reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP01

About •

Received ※ 06 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 21 November 2023 — Issued ※ 02 December 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOSRP17

Development of an ERL for Coherent Electron Cooling at the Electron-Ion Collider

87

K.E. Deitrick, S.V. Benson
JLab, Newport News, Virginia, USA
W.F. Bergan, A.V. Fedotov, D. Kayran, E. Wang, D. Xu
BNL, Upton, New York, USA
J.V. Conway, B.M. Dunham, R.G. Eichhorn, C.M. Gulliford, V.O. Kostroun, C.E. Mayes, K.W. Smolenski, N.W. Taylor
Xelera Research LLC, Ithaca, New York, USA
N. Wang
Cornell University, Ithaca, New York, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract DE-AC05-06OR23177 and Brookhaven Science Associates, LLC, Contract DE-SC0012704; Xelera supported by U.S. DOE grant DE-SC0020514.
The Electron-Ion Collider (EIC) is currently under development of to be built at Brookhaven National Lab and requires cooling during collisions in order to preserve the quality of the hadron beam despite degradation due to intra-beam scattering and beam-beam effect. An Energy Recovery Linac (ERL) is being designed to deliver the necessary electron beam for the Coherent electron Cooling (CeC) of the hadron beam, with an electron bunch charge of 1 nC and an average current of 100 mA; two modes of operation are being developed for 150 and 55 MeV electrons, corresponding to 275 and 100 GeV protons. The injector of this SHC-ERL is shared with the Precooler ERL, which cools lower energy proton beams via bunched-beam cooling, as used in Low Energy RHIC electron Cooling (LEReC). This paper reviews the current state of the design.

DOI •

reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP17

About •

Received ※ 11 October 2023 — Accepted ※ 12 October 2023 — Issued ※ 02 December 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)